EP3539678B1 - No-drip hot melt glue gun - Google Patents
No-drip hot melt glue gun Download PDFInfo
- Publication number
- EP3539678B1 EP3539678B1 EP19162562.3A EP19162562A EP3539678B1 EP 3539678 B1 EP3539678 B1 EP 3539678B1 EP 19162562 A EP19162562 A EP 19162562A EP 3539678 B1 EP3539678 B1 EP 3539678B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glue
- chamber
- melt
- melt chamber
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003292 glue Substances 0.000 title claims description 128
- 239000012943 hotmelt Substances 0.000 title claims description 15
- 239000000155 melt Substances 0.000 claims description 50
- 230000007246 mechanism Effects 0.000 claims description 22
- 239000004836 Glue Stick Substances 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
- B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
- B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
- B05C17/00526—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application
- B05C17/0053—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application the driving means for the material being manual, mechanical or electrical
- B05C17/00533—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application the driving means for the material being manual, mechanical or electrical comprising a piston
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
- B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
- B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
- B05C17/00526—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application
- B05C17/0053—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application the driving means for the material being manual, mechanical or electrical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/001—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work incorporating means for heating or cooling the liquid or other fluent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
Definitions
- This invention relates to the art of hot melt glue guns, and in particular, to hot melt glue guns with a mechanism to reduce dripping of glue from a nozzle after termination of the glue dispensing.
- thermoplastics A fundamental property of thermoplastics is its volumetric expansion as a function of temperature - commonly called thermal expansion.
- the coefficient of thermal expansion for most thermoplastics is known.
- rate of thermal expansion is in the range of 5 500 °Cm/m (100 microinches/inch/ degree F), so this translates to about a 5% volumetric expansion.
- the temperature of the melt chamber temporarily drops, because the melt chamber must heat the glue stick from a temperature of about 25°C (about 75°F) to, for example, 175°C (350°F) in a relatively short period of time.
- the temperature of the glue increases it expands, and the more quickly glue is fed into the melt chamber, the more it is affected by this thermal expansion. This volumetric expansion is the primary cause of leaking in the glue guns.
- the thermal expansion can be calculated to be theoretically about 3.8 mm (0.15" of linear expansion, which is about 0.41 mL (0.025 cubic inches) of glue available to drip or drool.
- a bead of glue 3.2 mm (0.125") in width a bead of about 51 mm (2") in length can form from the glue that is available to drool just from thermal expansion.
- the glue stick naturally retracts a little bit when dispensing pressure is released, resulting from the release of the pressure on the glue stick that must be applied to open the ball check-valve in the nozzle during dispensing. This slight retraction reduces the pressure in the melt chamber, and the length of a bead of glue after the user stops feeding the glue stick into the melt chamber is in practice typically about 1 inch as the pressure relief is satisfied and the dispensing stops gradually.
- dripping is prevented by rapidly depressurizing the melt chamber when delivery of glue is terminated.
- the present invention provides a hot melt glue gun according to claim 1.
- depressurizing is achieved by drawing off, or siphoning, a small portion of the melted glue into an auxiliary chamber that is in fluid communication with the melting chamber.
- the melt chamber and the auxiliary chamber are connected by a small tube that carries melted glue between the two chambers.
- the pressure of the glue throughout the melt chamber, including pressure on the nozzle is quickly relieved to prevent dripping.
- melted glue is drawn from the melt chamber into the auxiliary chamber by movement of a piston within the auxiliary chamber.
- the piston can be about the diameter of a glue stick.
- the piston moves in direction away from the inlet of the tube to the auxiliary chamber to draw liquid glue from the melt chamber into the auxiliary chamber by increasing the size of the auxiliary chamber and thereby reducing the pressure in the auxiliary chamber. Movement of the piston in an opposite direction forces melted glue from the auxiliary chamber back into the melt chamber.
- the auxiliary chamber is preferably a cavity that is cylindrical and circular in cross section but it can take other shapes. For example, the cross section need not be circular and the chamber can be other than cylindrical.
- the cavity can be formed in a solid material, such as plastic or metal, and is preferably formed of cast metal.
- the auxiliary chamber can also be formed in part of a cast metal body integral with another part forming the melt chamber.
- the piston can be spring-loaded to cause it to move in a direction away from the tube upon release of a user's pulling on a trigger in a glue advancement mechanism.
- This draws glue from the main chamber into an auxiliary chamber and relieves pressure in the main, melt chamber.
- An assembly of cooperating elements is activated by the glue advancement mechanism which can push the piston toward the passage connected to the melt chamber, thus emptying this additional volume of glue in the auxiliary chamber back into the main melt chamber as glue is dispensed from the melt chamber.
- the spring will again push the piston outward, drawing a volume of melted glue from the main chamber with it to relieve the pressure in the main melt chamber or, possibly, creating a slight vacuum within the melt chamber.
- the outward movement of the piston quickly pulls some of the melted glue away from the main melt chamber, thus also removing glue from within the nozzle to prevent dripping.
- auxiliary chamber could be replaced by a flexible diaphragm that would draw glue into a chamber of selected shape.
- auxiliary chamber could comprise two parts with complimentary cavities that move with respect to each other to form a closed cavity of variable volume (e.g., a first tube that slides within a second tube).
- FIG 1 shows a first embodiment of the invention.
- a hot melt glue gun 2 includes a body portion 4 having a glue stick advancing mechanism 6.
- the glue stick advancing mechanism includes a trigger 8, which engages a pivotally mounted lever 7 to advance a glue stick 9 (see figure 3 ) into a melt chamber 10.
- the melt chamber 10 is heated by electric heating elements 11 (see figure 3 ) and is typically made of cast metal.
- a sleeve 12 is provided at the inlet to the melt chamber to seal melted glue in the chamber and to guide a glue stick as it enters the melt chamber.
- a dispensing nozzle 14 is located at the outlet of the melt chamber. This nozzle typically includes a ball check valve 15 (see figure 3 ), the ball being held against a valve seat by a spring 17 (see figure 3 ) such that the glue must be under a certain pressure before the check valve will open and allow melted glue to be dispensed.
- Adjacent the melt chamber 10 is an auxiliary chamber 16 that is connected to the melt chamber by a tubular passage 18.
- a piston 20 located in the auxiliary chamber 16 can move in the chamber toward and away from the tubular passage.
- the piston 20 is moved in a direction away from the tubular passage 18 the pressure in the auxiliary chamber 16 and the tubular passage 18 will be lowered, and melted glue will flow from the melt chamber into the auxiliary chamber.
- the piston is moved in a direction toward the tubular passage 18, the pressure of the glue in the auxiliary chamber 16 increases, forcing glue in the auxiliary chamber through the passage 18 and back into the melt chamber 10.
- the auxiliary chamber is a part of a metal casting that also forms the melt chamber 10 and is heated by the same electric heating elements that heat the melt chamber 10.
- the temperature of the auxiliary chamber is high enough to maintain glue in the auxiliary chamber melted when the glue gun is in use and to melt any cold glue in that chamber during startup.
- the auxiliary chamber could, however, be formed in a separate casting and heated by the same heater that heats the melt chamber or a separate one.
- a user squeezes the trigger 8, pulling it toward the body 4 of the glue gun.
- a stem 24 on the back of the trigger engages one side of a lever 26 that is rotationally mounted to the body at a pin 28.
- the other side of the lever 26 engages a shaft 30 that in turn engages the rear of the piston 20, forcing the piston forward.
- the glue in the auxiliary chamber is forced through the passage 18 back into the melt chamber and becomes part of the glue that is dispensed.
- the embodiment of figure 2 illustrates an alternate trigger mechanism.
- the trigger 32 is mounted to the body 4 for rotation about the pin 34.
- the trigger 32 is mounted such that a user can engage the lower portion 36 of the trigger and dispense glue by pulling that portion toward the body 4 of the glue gun.
- One side of the trigger 32 includes a boss 38 that rotates upwardly when a user pulls on portion 36 of the trigger.
- a toothed disc 40 having teeth 42 is mounted adjacent the trigger 34.
- the disc 40 has a boss 44, which engages boss 38 on the trigger. Upon motion of the trigger 32 toward the body of the glue gun the two bosses 38 and 44 engage to drive disc 40 counterclockwise.
- a cam 46 is pivotally mounted on the body and has teeth 48 that are in contact with teeth 42, whereby counterclockwise rotation of the disc 40 drives the cam 46 clockwise.
- An upper part (not shown) of the cam 46 engages a shaft 50, an opposite end of which engages the piston 20.
- the end of the shaft 50 in contact with the piston pushes the piston toward the passage 18 to return any glue in the auxiliary chamber to the melt chamber.
- spring 22 pushes the piston away from the passage 18, which returns the cam 46 and disc 40 to the positions shown in figure 2 and draws glue out of the melt chamber to relieve pressure in the melt chamber and evacuate glue from the nozzle to prevent dripping.
- Figure 3 illustrates another embodiment of a glue gun in accordance with the invention.
- the embodiment of figure 3 is similar to those of figures 1 and 2 but figure 3 additionally shows the glue stick 9 and the electric heating element 11.
- Figure 3 also shows a known spring-controlled ball check valve 15 inside the dispensing nozzle 14.
- a spring 17 urges the ball against a seat to bias the check valve in a closed condition preventing flow of glue into the nozzle.
- the mechanism that operates the movable piston 20 is provided with a pressure relief spring 76 to prevent breakage of the mechanism when the glue advancing mechanism is operated before the glue is sufficiently melted or the piston is otherwise prevented from moving freely in the auxiliary chamber 16.
- a trigger 52 is pivotally attached to the housing 4 at a pivot pin 54, and an upper part 56 of the trigger is pivotally connected to the glue advancement mechanism 6 whereby a user's rotation of the trigger 52 toward the housing advances the glue stick into the melt chamber 10 to dispense glue.
- the motion of the piston 20 is controlled by a piston actuation shaft 58, which is positioned adjacent the auxiliary chamber 16.
- the piston actuation shaft is located just below the melt chamber with one end 60 supported in relief spring housing 66 for linear motion toward and away from the piston 20.
- the opposite end 62 of the piston actuation shaft is supported on an upper portion 64 of a bar 68, which is pivotally mounted on the housing at pin 70.
- a lower part 72 of the bar 68 is positioned to engage a projection 74 of the trigger 52.
- end 62 of the piston actuation shaft is cylindrical and the upper part 64 of the bar 68 is shaped to provide a smooth motion of the piston actuation shaft 58 during dispensing of glue.
- Projections 78 extend on opposite sides of upper end 64 to maintain alignment of end 62 of the shaft with end 64 of the bar. Spring 76 ensures continuous contact between the two ends.
- a spring 82 in the glue advancement mechanism urges trigger 52 toward its initial position, and spring 22 urges piston 20 to the left of figure 3 to withdraw glue into auxiliary chamber 16 to prevent the dripping of glue from dispensing nozzle 14.
- Figure 3 also illustrates O-ring 84 on the piston to seal the auxiliary chamber and prevent leakage of glue past the piston.
- the glue gun disclosed operates to force glue out of the auxiliary chamber 16 when a user pulls on the trigger, by pushing the piston toward the passage 18. This returns the glue in the auxiliary chamber to the melt chamber for mixing with the glue already in the melt chamber for dispensing. Conversely, when the user releases pressure on the trigger, the spring 22 pushes the piston 20 away from passage 18, thus drawing glue from the melt chamber and relieving the pressure in the chamber to reduce dripping.
- the auxiliary chamber withdraws a volume of melted glue in the range of 25-35% of the volume of solid glue added to the chamber during a discharge.
- auxiliary chamber has been illustrated as extending essentially parallel to the melt chamber, it can be oriented in other directions.
- the auxiliary chamber can be oriented such that the piston moves transversely to the longitudinal axis of the melt chamber.
- the auxiliary chamber can extend into the melt chamber.
- the piston alone can be arranged to move into and out of the melt chamber to withdraw melted glue into the space occupied by the piston during dispensing.
- movement of the piston is coordinated with the operation of a glue-stick advancing mechanism.
- movement of the piston is mechanically controlled by such operation, but it is within the scope of the disclosure to provide for other methods of control, such as electronic, pneumatic, or fluid.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Coating Apparatus (AREA)
- Ink Jet (AREA)
Description
- This invention relates to the art of hot melt glue guns, and in particular, to hot melt glue guns with a mechanism to reduce dripping of glue from a nozzle after termination of the glue dispensing.
- An undesirable feature of many hot melt glue guns is that they leak from the nozzle opening on warm-up as well as during normal use of the gun. In the typical construction of a glue gun, a user feeds a glue stick at room temperature into a relatively short melt chamber having a temperature in the range of 120°C to 205°C (250°F to 400°F), depending on the model and the glue stick formulation.
- A fundamental property of thermoplastics is its volumetric expansion as a function of temperature - commonly called thermal expansion. The coefficient of thermal expansion for most thermoplastics is known. For most EVA based formulas, the rate of thermal expansion is in the range of 5 500 °Cm/m (100 microinches/inch/ degree F), so this translates to about a 5% volumetric expansion.
- As the user feeds a glue stick into the melt chamber, the temperature of the melt chamber temporarily drops, because the melt chamber must heat the glue stick from a temperature of about 25°C (about 75°F) to, for example, 175°C (350°F) in a relatively short period of time. As the temperature of the glue increases it expands, and the more quickly glue is fed into the melt chamber, the more it is affected by this thermal expansion. This volumetric expansion is the primary cause of leaking in the glue guns.
- Use of a glue gun lightly requires only a small amount of cold stick be heated, resulting in a relatively small amount of thermal expansion in a given time period. However, when a glue gun is used heavily, such as when multiple glue sticks are fed serially into the melt chamber rapidly, each complete stick must be heated in a short period of time, resulting in thermal expansion of a large amount of glue in a short time.
- For a typical glue stick having a diameter of about 11.5 mm (0.450"), the thermal expansion can be calculated to be theoretically about 3.8 mm (0.15" of linear expansion, which is about 0.41 mL (0.025 cubic inches) of glue available to drip or drool. For a bead of glue 3.2 mm (0.125") in width, a bead of about 51 mm (2") in length can form from the glue that is available to drool just from thermal expansion. In practice, the glue stick naturally retracts a little bit when dispensing pressure is released, resulting from the release of the pressure on the glue stick that must be applied to open the ball check-valve in the nozzle during dispensing. This slight retraction reduces the pressure in the melt chamber, and the length of a bead of glue after the user stops feeding the glue stick into the melt chamber is in practice typically about 1 inch as the pressure relief is satisfied and the dispensing stops gradually.
- In addition many glue guns experience thermal expansion of the solid glue that is already within the chamber on warm up, resulting in an inevitable drip.
- It is known to inhibit dripping by: an expansible melting chamber (
US 4 804 110 A ), blowing away residual adhesive with exhaust air (US 5 375 766 A ), a spring and a ball valve (WO 2006/047090 A2 ), or a suck-back feature provided by a plunger (US 6 152 386 A ).US 2008/0073448 A1 discloses use of a blast of gas to prevent stringing. - In accordance with the invention, dripping is prevented by rapidly depressurizing the melt chamber when delivery of glue is terminated.
- The present invention provides a hot melt glue gun according to claim 1.
- In a preferred embodiment, depressurizing is achieved by drawing off, or siphoning, a small portion of the melted glue into an auxiliary chamber that is in fluid communication with the melting chamber. The melt chamber and the auxiliary chamber are connected by a small tube that carries melted glue between the two chambers. As liquid glue flows into the auxiliary chamber, the pressure of the glue throughout the melt chamber, including pressure on the nozzle, is quickly relieved to prevent dripping.
- In the preferred embodiments illustrated, melted glue is drawn from the melt chamber into the auxiliary chamber by movement of a piston within the auxiliary chamber. The piston can be about the diameter of a glue stick. The piston moves in direction away from the inlet of the tube to the auxiliary chamber to draw liquid glue from the melt chamber into the auxiliary chamber by increasing the size of the auxiliary chamber and thereby reducing the pressure in the auxiliary chamber. Movement of the piston in an opposite direction forces melted glue from the auxiliary chamber back into the melt chamber. The auxiliary chamber is preferably a cavity that is cylindrical and circular in cross section but it can take other shapes. For example, the cross section need not be circular and the chamber can be other than cylindrical. The cavity can be formed in a solid material, such as plastic or metal, and is preferably formed of cast metal. The auxiliary chamber can also be formed in part of a cast metal body integral with another part forming the melt chamber.
- The piston can be spring-loaded to cause it to move in a direction away from the tube upon release of a user's pulling on a trigger in a glue advancement mechanism. This draws glue from the main chamber into an auxiliary chamber and relieves pressure in the main, melt chamber. An assembly of cooperating elements is activated by the glue advancement mechanism which can push the piston toward the passage connected to the melt chamber, thus emptying this additional volume of glue in the auxiliary chamber back into the main melt chamber as glue is dispensed from the melt chamber. When the force applied to the trigger is released, the spring will again push the piston outward, drawing a volume of melted glue from the main chamber with it to relieve the pressure in the main melt chamber or, possibly, creating a slight vacuum within the melt chamber. The outward movement of the piston quickly pulls some of the melted glue away from the main melt chamber, thus also removing glue from within the nozzle to prevent dripping.
- Other constructions of the auxiliary chamber are possible. For example, the piston could be replaced by a flexible diaphragm that would draw glue into a chamber of selected shape. Also the auxiliary chamber could comprise two parts with complimentary cavities that move with respect to each other to form a closed cavity of variable volume (e.g., a first tube that slides within a second tube).
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Figure 1 shows the left side of the housing of a first embodiment of a glue gun with certain of the interior elements being shown in vertical cross section. -
Figure 2 shows the left side of the housing of a second embodiment of a glue gun with certain of the interior elements being shown in vertical cross section. -
Figure 3 shows the left side of the housing of a third embodiment of a glue gun with certain of the interior elements being shown in vertical cross section. - With reference to the drawing figures, elements providing similar functions are generally identified by the same reference numerals.
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Figure 1 shows a first embodiment of the invention. A hotmelt glue gun 2 includes abody portion 4 having a gluestick advancing mechanism 6. The glue stick advancing mechanism includes atrigger 8, which engages a pivotally mountedlever 7 to advance a glue stick 9 (seefigure 3 ) into amelt chamber 10. - The
melt chamber 10 is heated by electric heating elements 11 (seefigure 3 ) and is typically made of cast metal. Asleeve 12 is provided at the inlet to the melt chamber to seal melted glue in the chamber and to guide a glue stick as it enters the melt chamber. A dispensingnozzle 14 is located at the outlet of the melt chamber. This nozzle typically includes a ball check valve 15 (seefigure 3 ), the ball being held against a valve seat by a spring 17 (seefigure 3 ) such that the glue must be under a certain pressure before the check valve will open and allow melted glue to be dispensed. - Adjacent the
melt chamber 10 is anauxiliary chamber 16 that is connected to the melt chamber by atubular passage 18. Apiston 20 located in theauxiliary chamber 16 can move in the chamber toward and away from the tubular passage. When thepiston 20 is moved in a direction away from thetubular passage 18 the pressure in theauxiliary chamber 16 and thetubular passage 18 will be lowered, and melted glue will flow from the melt chamber into the auxiliary chamber. When the piston is moved in a direction toward thetubular passage 18, the pressure of the glue in theauxiliary chamber 16 increases, forcing glue in the auxiliary chamber through thepassage 18 and back into themelt chamber 10. - Preferably the auxiliary chamber is a part of a metal casting that also forms the
melt chamber 10 and is heated by the same electric heating elements that heat themelt chamber 10. Thus, the temperature of the auxiliary chamber is high enough to maintain glue in the auxiliary chamber melted when the glue gun is in use and to melt any cold glue in that chamber during startup. The auxiliary chamber could, however, be formed in a separate casting and heated by the same heater that heats the melt chamber or a separate one. - When glue is to be dispensed, a user squeezes the
trigger 8, pulling it toward thebody 4 of the glue gun. Astem 24 on the back of the trigger engages one side of alever 26 that is rotationally mounted to the body at apin 28. The other side of thelever 26 engages ashaft 30 that in turn engages the rear of thepiston 20, forcing the piston forward. When the piston moves forward, toward thepassage 18, the glue in the auxiliary chamber is forced through thepassage 18 back into the melt chamber and becomes part of the glue that is dispensed. - When the user's pressure on the
trigger 8 is released, however, the force applied by thelever 26 to theshaft 30 is released, which also releases the force applied by theshaft 30 on the piston and allows thespring 22 to drive the piston away from the passage, thus drawing glue from themelt chamber 10. - The embodiment of
figure 2 illustrates an alternate trigger mechanism. In this embodiment, thetrigger 32 is mounted to thebody 4 for rotation about thepin 34. Thetrigger 32 is mounted such that a user can engage thelower portion 36 of the trigger and dispense glue by pulling that portion toward thebody 4 of the glue gun. One side of thetrigger 32 includes aboss 38 that rotates upwardly when a user pulls onportion 36 of the trigger. Atoothed disc 40 havingteeth 42 is mounted adjacent thetrigger 34. Thedisc 40 has aboss 44, which engagesboss 38 on the trigger. Upon motion of thetrigger 32 toward the body of the glue gun the twobosses disc 40 counterclockwise. Acam 46 is pivotally mounted on the body and hasteeth 48 that are in contact withteeth 42, whereby counterclockwise rotation of thedisc 40 drives thecam 46 clockwise. An upper part (not shown) of thecam 46 engages ashaft 50, an opposite end of which engages thepiston 20. When the user pulls on thetrigger 32, the end of theshaft 50 in contact with the piston pushes the piston toward thepassage 18 to return any glue in the auxiliary chamber to the melt chamber. When the user releases pressure on thetrigger 36,spring 22 pushes the piston away from thepassage 18, which returns thecam 46 anddisc 40 to the positions shown infigure 2 and draws glue out of the melt chamber to relieve pressure in the melt chamber and evacuate glue from the nozzle to prevent dripping. -
Figure 3 illustrates another embodiment of a glue gun in accordance with the invention. The embodiment offigure 3 is similar to those offigures 1 and2 butfigure 3 additionally shows theglue stick 9 and theelectric heating element 11.Figure 3 also shows a known spring-controlledball check valve 15 inside the dispensingnozzle 14. Aspring 17 urges the ball against a seat to bias the check valve in a closed condition preventing flow of glue into the nozzle. - In the embodiment of
figure 3 the mechanism that operates themovable piston 20 is provided with apressure relief spring 76 to prevent breakage of the mechanism when the glue advancing mechanism is operated before the glue is sufficiently melted or the piston is otherwise prevented from moving freely in theauxiliary chamber 16. In this embodiment atrigger 52 is pivotally attached to thehousing 4 at apivot pin 54, and anupper part 56 of the trigger is pivotally connected to theglue advancement mechanism 6 whereby a user's rotation of thetrigger 52 toward the housing advances the glue stick into themelt chamber 10 to dispense glue. The motion of thepiston 20 is controlled by apiston actuation shaft 58, which is positioned adjacent theauxiliary chamber 16. The piston actuation shaft is located just below the melt chamber with one end 60 supported in relief spring housing 66 for linear motion toward and away from thepiston 20. Theopposite end 62 of the piston actuation shaft is supported on anupper portion 64 of abar 68, which is pivotally mounted on the housing atpin 70. Alower part 72 of thebar 68 is positioned to engage aprojection 74 of thetrigger 52. - When a user initiates the dispensing of glue by pulling the
trigger 52 toward thehousing 4,projection 74 moves thelower end 72 of thebar 68 in a clockwise direction, andupper end 64 of thebar 68 engagesend 62 of the piston actuation shaft to move the shaft toward thepiston 20. Apressure relief spring 76 is located between end 60 of the piston actuation shaft andpiston 20. Movement of the actuation shaft in a rightward direction in turn moves thepiston 20 to the right to force melted glue from theauxiliary chamber 16. If the user pulls on thetrigger 52 before glue in the auxiliary chamber is sufficiently melted, or there is an obstruction to free motion of the piston,spring 76 will compress to prevent damage to other parts of the glue-gun mechanism. - In the embodiment illustrated in
figure 3 , end 62 of the piston actuation shaft is cylindrical and theupper part 64 of thebar 68 is shaped to provide a smooth motion of thepiston actuation shaft 58 during dispensing of glue.Projections 78 extend on opposite sides ofupper end 64 to maintain alignment ofend 62 of the shaft withend 64 of the bar.Spring 76 ensures continuous contact between the two ends. - When a user releases pressure on the
trigger 52, aspring 82 in the glue advancement mechanism urges trigger 52 toward its initial position, andspring 22 urgespiston 20 to the left offigure 3 to withdraw glue intoauxiliary chamber 16 to prevent the dripping of glue from dispensingnozzle 14. -
Figure 3 also illustrates O-ring 84 on the piston to seal the auxiliary chamber and prevent leakage of glue past the piston. - In use, the glue gun disclosed operates to force glue out of the
auxiliary chamber 16 when a user pulls on the trigger, by pushing the piston toward thepassage 18. This returns the glue in the auxiliary chamber to the melt chamber for mixing with the glue already in the melt chamber for dispensing. Conversely, when the user releases pressure on the trigger, thespring 22 pushes thepiston 20 away frompassage 18, thus drawing glue from the melt chamber and relieving the pressure in the chamber to reduce dripping. - As noted above, glue experiences a thermal volume expansion of about 5% during melting. Thus, advancement of the glue stick into the melt chamber during discharge of melted glue through the nozzle adds solid glue to the melt chamber, which expands as it melts. Upon termination of glue discharge, the volume of glue withdrawn into the auxiliary chamber fully or at least partially empties the nozzle. Even partial emptying of the nozzle greatly reduces or even eliminates dripping of the glue from the nozzle. The volume withdrawn can also be large enough to include the glue expansion resulting from heating un-melted glue added to the melt chamber by advancing the glue stick during discharge. In an embodiment, the auxiliary chamber withdraws a volume of melted glue in the range of 25-35% of the volume of solid glue added to the chamber during a discharge.
- Use of the auxiliary chamber described above with a ball check valve in the nozzle, as illustrated in
figure 3 provides a particular advantage. When the user's pressure on the trigger is released, thepiston 20 can quickly withdraw glue from the melt chamber in the immediate area of thepassage 16, which also pulls glue back from the nozzle. This reduction of pressure in the glue allows the ball check valve to close quickly, resulting in a quick cutoff of the glue discharge. This contrasts with prior art glue guns where the check valve closes slowly as the pressure in the melt chamber bleeds off, resulting in dripping and stringing. In addition, withdrawal of glue from the nozzle in the glue gun of the invention pulls glue away from the nozzle tip, causing turbulence in the melted glue. This turbulence further reduces or eliminates stringing of the glue as well as dripping. - While the auxiliary chamber has been illustrated as extending essentially parallel to the melt chamber, it can be oriented in other directions. For example, the auxiliary chamber can be oriented such that the piston moves transversely to the longitudinal axis of the melt chamber. As well, it is within the scope of the invention that the auxiliary chamber can extend into the melt chamber. Alternatively, the piston alone can be arranged to move into and out of the melt chamber to withdraw melted glue into the space occupied by the piston during dispensing.
- It will be appreciated that in the disclosed embodiments, movement of the piston is coordinated with the operation of a glue-stick advancing mechanism. In the embodiments disclosed, movement of the piston is mechanically controlled by such operation, but it is within the scope of the disclosure to provide for other methods of control, such as electronic, pneumatic, or fluid.
- Modifications within the scope of the appended claims will be apparent to those of skill in the art.
Claims (8)
- A hot melt glue gun (2) comprising a body (4), a melt chamber (10) mounted in said body (4) for heating a glue composition, a discharge nozzle (14) connected to said melt chamber (10) for receiving glue therefrom and discharging glue, and a glue stick advancement mechanism (6) for selectively supplying glue to said melt chamber (10) and causing glue in said melt chamber (10) to discharge through said discharge nozzle (14), characterised by an auxiliary chamber (16) in fluid communication with said melt chamber (10), a siphon mechanism (20) that draws glue from said melt chamber (10) into said auxiliary chamber (16) upon termination of the supply of glue to said melt chamber (10) by said glue advancement mechanism (6).
- A hot melt glue gun (2) according to claim 1, characterised in that said siphon mechanism (20) returns glue in said auxiliary chamber (16) to said melt chamber (10) when said glue advancement mechanism (6) causes glue to discharge.
- A hot melt glue gun (2) according to claim 2, characterised in that said siphon mechanism comprises a piston (20) that is movable within said auxiliary chamber (16) to vary the volume of said auxiliary chamber selectively.
- A hot melt glue gun (2) according to claim 3, characterised in that said siphon mechanism (20) cooperates with a shaft (30, 50, 58) that moves said piston to force glue from said auxiliary chamber.
- A hot melt glue gun (2) according to any one of claims 1 to 4, characterised in that said siphon mechanism (20) cooperates with a trigger (8, 36, 52) of the hot melt glue gun (2) to draw glue from said melt chamber (10) into said auxiliary chamber (16) upon termination of the supply of glue to said melt chamber (10) by said glue advancement mechanism (6).
- A hot melt glue gun (2) according to claim 5, characterised in that said shaft (30, 50, 58) moves in concert with movement of said trigger (8, 36, 52).
- A hot melt glue gun (2) according to claim 6, characterised in that said trigger (52) engages a bar (68) that is pivotally mounted to said body (4) and said bar (68) engages said shaft (58) to move said shaft (58).
- A hot melt glue gun (2) according to any one of claims 1 to 7, characterised in that a check valve (15) is positioned between said melt chamber (10) and said discharge nozzle (14), said check valve (15) being biased toward a closed condition that prevents flow of glue from said melt chamber (10) to said discharge nozzle (14) and being placed in an open condition that passes glue from said melt chamber (10) to said nozzle (14) when the pressure in said melt chamber (10) exceeds a predetermined amount, and a passage (18) in fluid communication between said auxiliary chamber (16) and said melt chamber (10) for conducting a flow of glue.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201862642759P | 2018-03-14 | 2018-03-14 | |
US16/295,083 US10486186B2 (en) | 2018-03-14 | 2019-03-07 | No-drip hot melt glue gun |
Publications (2)
Publication Number | Publication Date |
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EP3539678A1 EP3539678A1 (en) | 2019-09-18 |
EP3539678B1 true EP3539678B1 (en) | 2021-04-14 |
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Application Number | Title | Priority Date | Filing Date |
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EP19162562.3A Active EP3539678B1 (en) | 2018-03-14 | 2019-03-13 | No-drip hot melt glue gun |
Country Status (4)
Country | Link |
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US (1) | US10486186B2 (en) |
EP (1) | EP3539678B1 (en) |
CN (1) | CN110270478B (en) |
CA (1) | CA3036602C (en) |
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WO2023091134A1 (en) * | 2021-11-17 | 2023-05-25 | Cft Llc | Applicator |
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-
2019
- 2019-03-07 US US16/295,083 patent/US10486186B2/en active Active
- 2019-03-13 CA CA3036602A patent/CA3036602C/en active Active
- 2019-03-13 EP EP19162562.3A patent/EP3539678B1/en active Active
- 2019-03-14 CN CN201910193686.3A patent/CN110270478B/en active Active
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CA3036602A1 (en) | 2019-09-14 |
CA3036602C (en) | 2021-03-02 |
CN110270478A (en) | 2019-09-24 |
US20190283073A1 (en) | 2019-09-19 |
US10486186B2 (en) | 2019-11-26 |
CN110270478B (en) | 2021-08-03 |
EP3539678A1 (en) | 2019-09-18 |
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